Customers should still be able to withdraw money using their bank card, as the bank have explained that ATMs are working.

Down Detector, a site which reports issues with websites, has seen a big spike in reported problems since around 4am this morning (September 21).

Many customers have taken to social media to share their frustrations.

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One Twitter user explained that the loss of the app was preventing them from paying bills, writing:

@NatWest_Help online banking and mobile app not working. Can’t go to work or pay my bills?

Another complained:

Hi @NatWest_Help – I’ve payments to make. That your app/mobile banking is down is testament to what a set of incompetent oafs you are. I assume you’ll recompense me if all goes wrong? You’re working hard apparently, I know.

@NatWest_Help online banking and mobile app not working. Can't go to work or pay my bills?

Hi @NatWest_Help – I’ve payments to make. That your app/mobile banking is down is testament to what a set of incompetent oafs you are. I assume you’ll recompense me if all goes wrong? You’re working hard apparently, I know.